- Joined
- May 14, 2014
- Messages
- 2,289
- Location
- Southwest Kootenays BC
- Tagline
- No such things as bad days, just bad moments
In the hopes it will fix a dead and or weak channel as it did before, I spent the afternoon re-capping a second APT Holman preamp that came into my possession. With only a few left to go (there are 41 of them), I pulled one in the tone control circuit and thought to ask before replacing it with one I have on hand.
I've been routinely using capacitors with voltage ratings one level higher than what I removed. What was in the tone control circuit is 16v 22mf but I have no 25v of same but I do have 50v.
My hesitation to use those is due to something I read recently whereby using a capacitor of higher voltage provided the capacitance rating is the same makes no difference in most cases but it can have an effect in some circuits with a particular design intent.
My understanding is that the guy who designed this pre-amp was a bit of a tweaky fellow so I was looking for opinions whether installing a higher voltage capacitor in a tone control circuit is safe to do or should I wait until Tuesday and get some 25V or even 16V.
I can't remember what I used in the first pre-amp, probably the 50v and I didn't notice anything amiss. As a matter of fact I think I recall that being so because the local shop didn't have any 25v or 35v 22mF when I re-capped the first pre-amp so that may be why I came to have these 50v in the first place.
EDIT: I was told once that in these pre-amps, there are only two electrolytics that the signal passes through but damned if I know which they are.
I've been routinely using capacitors with voltage ratings one level higher than what I removed. What was in the tone control circuit is 16v 22mf but I have no 25v of same but I do have 50v.
My hesitation to use those is due to something I read recently whereby using a capacitor of higher voltage provided the capacitance rating is the same makes no difference in most cases but it can have an effect in some circuits with a particular design intent.
My understanding is that the guy who designed this pre-amp was a bit of a tweaky fellow so I was looking for opinions whether installing a higher voltage capacitor in a tone control circuit is safe to do or should I wait until Tuesday and get some 25V or even 16V.
I can't remember what I used in the first pre-amp, probably the 50v and I didn't notice anything amiss. As a matter of fact I think I recall that being so because the local shop didn't have any 25v or 35v 22mF when I re-capped the first pre-amp so that may be why I came to have these 50v in the first place.
EDIT: I was told once that in these pre-amps, there are only two electrolytics that the signal passes through but damned if I know which they are.
Last edited:
